JP2015019307A5 - - Google Patents
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上述の問題点を解決するため、本発明の画像符号化装置は以下の構成を有する。すなわち、動画像を構成する画像を複数の階層で階層符号化する画像符号化装置であって、前記画像の第１の階層に対応する第１の画像と、当該第１の階層と異なる第２の階層に対応する第２の画像であって、前記第１の画像を参照して符号化される第２の画像と、前記第１及び第２の階層と異なる第３の階層に対応する第３の画像であって、前記第２の画像を参照して符号化される第３の画像とのうち少なくともいずれかを取得する第１の取得手段と、前記第１の画像、前記第２の画像、及び前記第３の画像のうちの少なくともいずれかを符号化する符号化手段と、を有し、前記符号化手段は、前記第２の画像内の所定領域を、前記第１の画像内の、前記第２の画像内の所定領域と対応する領域及び／又は前記第２の画像の所定領域と対応する領域以外の領域を参照して符号化し、前記第３の画像内の、前記第２の画像内の所定領域に対応する領域を、前記第２の画像内の所定領域以外の領域を参照せずに、前記第２の画像内の所定領域を参照して符号化する。 In order to solve the above-described problems, the image coding apparatus of the present invention has the following configuration. That is, an image encoding apparatus that hierarchically encodes an image constituting a moving image in a plurality of hierarchies, the first image corresponding to the first hierarchy of the image being different from the first hierarchy. A second image corresponding to the first layer, a second image encoded with reference to the first image, and a second image corresponding to a third layer different from the first and second layers. A first acquisition unit that acquires at least one of a third image encoded with reference to the second image, the first image, and the second image An encoding unit that encodes at least one of the image and the third image, and the encoding unit defines a predetermined area in the second image as a part of the first image. Corresponding to a predetermined area in the second image and / or corresponding to a predetermined area of the second image An area other than the predetermined area in the second image is referred to for an area in the third image that corresponds to the predetermined area in the second image. Instead, encoding is performed with reference to a predetermined area in the second image.
上述の問題点を解決するため、本発明の画像復号装置は以下の構成を有する。すなわち、動画像を構成する画像を複数の階層で階層符号化された符号化データを復号する画像復号装置であって、前記符号化データから生成される、前記画像の第１の階層に対応する第１の画像と、当該第１の階層と異なる第２の階層に対応する第２の画像であって、前記第１の画像を参照して復号される第２の画像と、前記第１及び第２の階層と異なる第３の階層に対応する第３の画像であって、前記第２の画像を参照して符号化される第３の画像とのうち少なくともいずれかに対応する符号化データを取得する第１の取得手段と、前記第１の画像、前記第２の画像、及び前記第３の画像のうちの少なくともいずれかに対応する符号化データを復号する復号手段と、を有し、前記復号手段は、記第２の画像内の所定領域に対応する符号化データを、前記第１の画像内の、前記第２の画像内の所定領域と対応する領域及び／又は前記第２の画像の所定領域と対応する領域以外の領域を参照して復号し、前記第３の画像内の、前記第２の画像内の所定領域に対応する領域に対応する符号化データを、前記第２の画像内の所定領域以外の領域を参照せずに、前記第２の画像内の所定領域を参照して復号する。 In order to solve the above-described problems, the image decoding apparatus of the present invention has the following configuration. That is, an image decoding apparatus that decodes encoded data obtained by hierarchically encoding images constituting a moving image in a plurality of hierarchies, and corresponds to a first hierarchy of the image generated from the encoded data A first image and a second image corresponding to a second layer different from the first layer, wherein the second image is decoded with reference to the first image; Encoded data corresponding to at least one of a third image corresponding to a third layer different from the second layer and encoded with reference to the second image And first decoding means for acquiring the encoded data corresponding to at least one of the first image, the second image, and the third image. The decoding means encodes a predetermined area in the second image. Data in the first image with reference to an area other than the area corresponding to the predetermined area in the second image and / or the area corresponding to the predetermined area in the second image, The encoded data corresponding to the region corresponding to the predetermined region in the second image in the third image is referred to the second data without referring to the region other than the predetermined region in the second image. The image is decoded with reference to a predetermined area in the image.
Claims (25)
前記画像の第１の階層に対応する第１の画像と、当該第１の階層と異なる第２の階層に対応する第２の画像であって、前記第１の画像を参照して符号化される第２の画像と、前記第１及び第２の階層と異なる第３の階層に対応する第３の画像であって、前記第２の画像を参照して符号化される第３の画像と
のうち少なくともいずれかを取得する第１の取得手段と、
前記第１の画像、前記第２の画像、及び前記第３の画像のうちの少なくともいずれかを符号化する符号化手段と、
を有し、
前記符号化手段は、
前記第２の画像内の所定領域を、前記第１の画像内の、前記第２の画像内の所定領域と対応する領域及び／又は前記第２の画像の所定領域と対応する領域以外の領域を参照して符号化し、
前記第３の画像内の、前記第２の画像内の所定領域に対応する領域を、前記第２の画像内の所定領域以外の領域を参照せずに、前記第２の画像内の所定領域を参照して符号化する
ことを特徴とする画像符号化装置。 An image encoding device that hierarchically encodes images constituting a moving image in a plurality of layers,
A first image corresponding to a first layer of the image and a second image corresponding to a second layer different from the first layer, the first image being encoded with reference to the first image A third image corresponding to a third layer different from the first and second layers, the third image being encoded with reference to the second image, First acquisition means for acquiring at least one of
Encoding means for encoding at least one of the first image, the second image, and the third image;
Have
The encoding means includes
The predetermined area in the second image is an area other than an area in the first image corresponding to the predetermined area in the second image and / or an area corresponding to the predetermined area in the second image. Encoding with reference to
An area in the third image corresponding to the predetermined area in the second image is not referred to an area other than the predetermined area in the second image, and the predetermined area in the second image is referred to. An image encoding device characterized in that encoding is performed with reference to FIG.
を有し、
前記判定手段によって、前記第２の画像の所定領域が前記特定の領域のみを参照して符号化されると判定された場合に、前記符号化手段は、前記第２の画像の所定領域以外を参照せずに、前記第２の画像の所定領域を参照して、前記第３の画像の、前記第２の画像の所定領域に対応する領域を符号化し、前記第１の画像における前記第２の画像の所定領域と対応する領域及び／又は前記第２の画像の所定領域と対応する領域以外の領域を参照して、前記第２の画像の所定領域を符号化する
ことを特徴とする請求項１に記載の画像符号化装置。 A determination unit configured to determine whether at least one of the first image, the second image, and the third image is encoded with reference to only a specific region; ,
When it is determined by the determination means that the predetermined area of the second image is encoded with reference to only the specific area, the encoding means may select a region other than the predetermined area of the second image. Without referring to the predetermined region of the second image, the region corresponding to the predetermined region of the second image of the third image is encoded, and the second image in the first image is encoded. The predetermined region of the second image is encoded with reference to a region corresponding to the predetermined region of the image and / or a region other than the region corresponding to the predetermined region of the second image. Item 2. The image encoding device according to Item 1.
前記符号化手段は、前記２の階層を符号化対象の階層とし、前記第２の画像を符号化対象の画像として符号化する場合に、前記第１の階層を参照対象の階層とし、前記第１の画像を参照対象の画像として用い、
前記第３の階層に対応する前記第３の画像は、前記第２の階層に対応する前記第２の画像より解像度又は画質の高い画像であり、
前記符号化手段は、前記３の階層を符号化対象の階層とし、前記第３の画像を符号化対象の画像として符号化する場合に、前記第２の階層を参照対象の階層とし、前記第２の画像を参照対象の画像として用いる
ことを特徴とする請求項１又は２に記載の画像符号化装置。 The second image corresponding to the second hierarchy is an image having a higher resolution or image quality than the first image corresponding to the first hierarchy;
The encoding unit sets the second hierarchy as an encoding target hierarchy, and when encoding the second image as an encoding target image, sets the first hierarchy as a reference target hierarchy, and 1 image is used as a reference image,
The third image corresponding to the third hierarchy is an image having a higher resolution or image quality than the second image corresponding to the second hierarchy;
The encoding means sets the third hierarchy as an encoding target hierarchy, and when encoding the third image as an encoding target image, sets the second hierarchy as a reference target hierarchy, and The image coding apparatus according to claim 1, wherein two images are used as reference images.
を有することを特徴とする請求項１〜３のいずれか１項に記載の画像符号化装置。 And determining means for determining whether at least one of the plurality of hierarchies includes an independent region to be encoded without referring to another region in the reference image. The image coding apparatus of any one of Claims 1-3.
を有することを特徴とする請求項４に記載の画像符号化装置。 5. The image encoding device according to claim 4, further comprising: a second encoding unit configured to encode information representing a layer having the lowest resolution or image quality in which the independent region is present among the plurality of layers.
を有することを特徴とする請求項１〜５のいずれか１項に記載の画像符号化装置。 When there is an independent area to be encoded without referring to another area in the reference image in the encoding target image, information indicating a position corresponding to the independent area in the encoding target image is encoded. The image encoding apparatus according to claim 1, further comprising: an output unit that outputs the encoded data.
を有し、
前記第２の取得手段は、シーケンス単位で前記フラグを生成する
ことを特徴とする請求項１〜６のいずれか１項に記載の画像符号化装置。 A flag indicating that the independent region exists in the encoding target image when there is an independent region to be encoded without referring to another region in the reference image in the encoding target image; Second acquisition means for acquiring at least one of the information on the position corresponding to the independent region in the encoding target image,
The image encoding apparatus according to claim 1, wherein the second acquisition unit generates the flag in units of sequences.
前記局所復号手段によって再生された前記復号画像の拡大を行う拡大手段と、
を有し、
前記拡大手段は、前記局所復号手段によって再生された前記復号画像のうち、符号化対象の画像の階層より空間解像度の低い階層の画像内の領域であって、前記符号化対象の画像における前記独立領域と相対的に等しい位置の領域のみを拡大する
ことを特徴とする請求項１〜７のいずれか１項に記載の画像符号化装置。 Local decoding means for reproducing a decoded image using encoded data generated by the encoding means;
An enlarging means for enlarging the decoded image reproduced by the local decoding means;
Have
The expansion means is a region in an image of a hierarchy having a spatial resolution lower than the hierarchy of the image to be encoded among the decoded images reproduced by the local decoding means, and the independent image in the image to be encoded The image coding apparatus according to claim 1, wherein only an area at a position relatively equal to the area is enlarged.
ことを特徴とする請求項１〜８のいずれか１項に記載の画像符号化装置。 The first acquisition means is means for acquiring the first image and the second image having different spatial resolutions from the image, and the first image obtained by reducing the second image is obtained. The image encoding device according to claim 1, wherein the image encoding device is acquired.
前記符号化データから生成される、前記画像の第１の階層に対応する第１の画像と、当該第１の階層と異なる第２の階層に対応する第２の画像であって、前記第１の画像を参照して復号される第２の画像と、前記第１及び第２の階層と異なる第３の階層に対応する第３の画像であって、前記第２の画像を参照して符号化される第３の画像とのうち少なくともいずれかに対応する符号化データを取得する第１の取得手段と、
前記第１の画像、前記第２の画像、及び前記第３の画像のうちの少なくともいずれかに対応する符号化データを復号する復号手段と、
を有し、
前記復号手段は、
記第２の画像内の所定領域に対応する符号化データを、前記第１の画像内の、前記第２の画像内の所定領域と対応する領域及び／又は前記第２の画像の所定領域と対応する領域以外の領域を参照して復号し、
前記第３の画像内の、前記第２の画像内の所定領域に対応する領域に対応する符号化データを、前記第２の画像内の所定領域以外の領域を参照せずに、前記第２の画像内の所定領域を参照して復号する
ことを特徴とする画像復号装置。 An image decoding apparatus that decodes encoded data obtained by hierarchically encoding images constituting a moving image in a plurality of layers,
A first image corresponding to a first layer of the image and a second image corresponding to a second layer different from the first layer, generated from the encoded data, the first image A second image decoded with reference to the first image and a third image corresponding to a third layer different from the first and second layers, wherein the second image is encoded with reference to the second image First acquisition means for acquiring encoded data corresponding to at least one of the third image to be converted;
Decoding means for decoding encoded data corresponding to at least one of the first image, the second image, and the third image;
Have
The decoding means includes
The encoded data corresponding to the predetermined area in the second image is the area corresponding to the predetermined area in the second image and / or the predetermined area of the second image in the first image. Decoding with reference to the area other than the corresponding area,
The encoded data corresponding to the region corresponding to the predetermined region in the second image in the third image is referred to the second data without referring to the region other than the predetermined region in the second image. An image decoding apparatus, wherein decoding is performed with reference to a predetermined area in the image.
を有し、
前記判定手段によって、前記第２の画像の所定領域に対応する符号化データが前記特定の領域のみを参照して復号されると判定された場合に、
前記復号手段は、前記第２の画像の所定領域以外を参照せずに、前記第２の画像の所定領域を参照して、前記第３の画像の、前記第２の画像の所定領域に対応する領域の符号化データを復号し、前記第１の画像における前記第２の画像の所定領域と対応する領域及び／又は前記第２の画像の所定領域と対応する領域以外の領域を参照して、前記第２の画像の所定領域の符号化データを復号する
ことを特徴とする請求項１０に記載の画像復号装置。 It is determined whether encoded data corresponding to at least one of the first image, the second image, and the third image is decoded with reference to only a specific region. A determination means,
When it is determined by the determination means that the encoded data corresponding to the predetermined area of the second image is decoded with reference to only the specific area,
The decoding means refers to the predetermined area of the second image without referring to the predetermined area of the second image, and corresponds to the predetermined area of the second image of the third image. The encoded data of the area to be decoded is decoded and the area corresponding to the predetermined area of the second image and / or the area other than the area corresponding to the predetermined area of the second image in the first image is referred to The image decoding apparatus according to claim 10, wherein encoded data of a predetermined area of the second image is decoded.
前記復号手段は、前記２の階層の符号化データを復号対象の階層の符号化データとし、前記第２の画像の符号化データを復号対象の画像の符号化データとして復号する場合に、前記第１の階層を参照対象の階層とし、前記第１の画像を参照対象の画像として用い、
前記第３の階層に対応する前記第３の画像は、前記第２の階層に対応する前記第２の画像より解像度又は画質の高い画像であり、
前記復号手段は、前記３の階層の符号化データを復号対象の階層の符号化データとし、前記第３の画像の符号化データを復号対象の画像の符号化データとして復号する場合に、前記第２の階層を参照対象の階層とし、前記第２の画像を参照対象の画像として用いる
ことを特徴とする請求項１０又は１１に記載の画像復号装置。 The second image corresponding to the second hierarchy is an image having a higher resolution or image quality than the first image corresponding to the first hierarchy;
When the decoding means decodes the encoded data of the second layer as encoded data of the decoding target layer, and decodes the encoded data of the second image as encoded data of the image to be decoded, 1 hierarchy is set as a reference target hierarchy, the first image is used as a reference target image,
The third image corresponding to the third hierarchy is an image having a higher resolution or image quality than the second image corresponding to the second hierarchy;
When the decoding means decodes the encoded data of the third hierarchy as encoded data of the hierarchy to be decoded and the encoded data of the third image as encoded data of the image to be decoded, The image decoding apparatus according to claim 10 or 11, wherein the second hierarchy is used as a reference target hierarchy, and the second image is used as a reference target image.
を有することを特徴とする請求項１０〜１２のいずれか１項に記載の画像復号装置。 The image processing apparatus includes a determination unit that determines whether or not an independent area that is decoded without referring to another area in the reference image is included in at least one of the plurality of hierarchies. Item 13. The image decoding device according to any one of Items 10 to 12.
を有し、
前記復号手段は、前記判定手段によって前記復号対象の領域が前記独立領域に含まれると判定された場合に、前記復号対象の階層を復号するための前記参照対象の階層における前記復号対象の領域に対応する位置に前記独立領域が設定されているか否かに基づいて、前記参照対象の階層の画像のうち参照対象の領域を決定し、前記参照対象の領域を用いて前記第１の取得手段によって取得された符号化データを復号する
ことを特徴とする請求項１０〜１３のいずれか１項に記載の画像復号装置。 Information on whether or not an independent area that is decoded without referring to another area in the reference image is included in at least one of the plurality of hierarchies, and a decoding target of the plurality of hierarchies Determination means for determining whether or not the region to be decoded is included in the independent region, based on information on the layer and information on the region to be decoded among images of the layer to be decoded,
When the determination unit determines that the decoding target region is included in the independent region, the decoding unit adds the decoding target region to the decoding target region in the reference target layer for decoding the decoding target layer. Based on whether or not the independent area is set at a corresponding position, a reference target area is determined from the images of the reference target hierarchy, and the first acquisition unit uses the reference target area. The obtained encoded data is decoded. The image decoding device according to any one of claims 10 to 13, wherein the encoded data is decoded.
を有し、
前記復号手段は、前記決定手段によって決定された前記参照対象の領域を用いて、前記第１の取得手段よって取得された符号化データを復号する
ことを特徴とする請求項１４に記載の画像復号装置。 Whether or not the independent area is set at a position corresponding to the decoding target area in the reference target hierarchy when the determination unit determines that the decoding target area is included in the independent area Based on the reference target hierarchy image, and determining means for determining the reference target region,
The image decoding according to claim 14, wherein the decoding unit decodes the encoded data acquired by the first acquisition unit using the reference target area determined by the determination unit. apparatus.
を有し、
前記決定手段は、前記第２の判定手段によって前記位置に前記独立領域が設定されていると判定された場合の参照領域の範囲よりも、前記第２の判定手段によって前記位置に前記独立領域が設定されていないと判定された場合の参照領域の範囲の方が小さくなるように、前記参照対象の領域を決定する
ことを特徴とする請求項１４に記載の画像復号装置。 Whether or not the independent area is set at a position corresponding to the decoding target area in the reference target hierarchy when the determination unit determines that the decoding target area is included in the independent area A second determination means for determining whether or not
The determining means is configured such that the independent area is located at the position by the second determining means, rather than the range of the reference area when the independent area is determined to be set at the position by the second determining means. The image decoding apparatus according to claim 14, wherein the reference target area is determined so that a range of the reference area when it is determined that the reference area is not set is smaller.
ことを特徴とする請求項１６に記載の画像復号装置。 The determining means determines the reference area as a range corresponding to the decoding target area in the reference target hierarchy when the second determination means determines that the independent area is set at the position. When the second determination unit determines that the independent region is not set at the position, the reference region is determined as the entire range of the image corresponding to the reference target hierarchy. The image decoding device according to claim 16.
を有することを特徴とする請求項１０〜１７のいずれか１項に記載の画像復号装置。 18. The apparatus according to claim 10, further comprising: a second decoding unit configured to decode encoded data of information representing a layer having the lowest resolution or image quality in which the independent region exists among the plurality of layers. The image decoding device according to item.
を有することを特徴とする請求項１０〜１８のいずれか１項に記載の画像復号装置。 A flag indicating that the independent region exists in the decoding target image when the decoding target image includes an independent region to be decoded without referring to another region in the reference image; and the decoding 19. The image according to claim 10, further comprising: a second acquisition unit configured to acquire at least one of information on a position corresponding to the independent region in the target image. Decoding device.
ことを特徴とする請求項１０〜１９のいずれか１項に記載の画像復号装置。 An enlarging unit that enlarges a decoded image decoded by the decoding unit, and 20. The image decoding apparatus according to claim 10, wherein only an area that is a position relatively equal to the independent area in the image to be decoded is enlarged.
ことを特徴とする請求項１０〜２０のいずれか１項に記載の画像復号装置。 The first image and the second image are images having different spatial resolutions, and the first image is an image obtained by reducing the second image. The image decoding device according to any one of the above.
前記画像の第１の階層に対応する第１の画像と、当該第１の階層と異なる第２の階層に対応する第２の画像であって、前記第１の画像を参照して符号化される第２の画像と、前記第１及び第２の階層と異なる第３の階層に対応する第３の画像であって、前記第２の画像を参照して符号化される第３の画像とのうち少なくともいずれかを取得する第１の取得手段と、
前記第１の画像、前記第２の画像、及び前記第３の画像のうちの少なくともいずれかを符号化する符号化工程と、
を有し、
前記符号化工程において、
前記第２の画像内の所定領域を、前記第１の画像内の、前記第２の画像内の所定領域と対応する領域及び／又は前記第２の画像の所定領域と対応する領域以外の領域を参照して符号化し、
前記第３の画像内の、前記第２の画像内の所定領域に対応する領域を、前記第２の画像内の所定領域以外の領域を参照せずに、前記第２の画像内の所定領域を参照して符号化する
ことを特徴とする画像符号化方法。 An image encoding method for hierarchically encoding images constituting a moving image in a plurality of layers,
A first image corresponding to a first layer of the image and a second image corresponding to a second layer different from the first layer, the first image being encoded with reference to the first image A third image corresponding to a third layer different from the first and second layers, the third image being encoded with reference to the second image, First acquisition means for acquiring at least one of
An encoding step of encoding at least one of the first image, the second image, and the third image;
Have
In the encoding step,
The predetermined area in the second image is an area other than an area in the first image corresponding to the predetermined area in the second image and / or an area corresponding to the predetermined area in the second image. Encoding with reference to
An area in the third image corresponding to the predetermined area in the second image is not referred to an area other than the predetermined area in the second image, and the predetermined area in the second image is referred to. An image encoding method characterized by encoding with reference to the above.
前記符号化データから生成される、前記画像の第１の階層に対応する第１の画像と、当該第１の階層と異なる第２の階層に対応する第２の画像であって、前記第１の画像を参照して復号される第２の画像と、前記第１及び第２の階層と異なる第３の階層に対応する第３の画像であって、前記第２の画像を参照して符号化される第３の画像とのうち少なくともいずれかに対応する符号化データを取得する第１の取得工程と、
前記第１の画像、前記第２の画像、及び前記第３の画像のうちの少なくともいずれかに対応する符号化データを復号する復号工程と、
を有し、
前記復号工程において、
記第２の画像内の所定領域に対応する符号化データを、前記第１の画像内の、前記第２の画像内の所定領域と対応する領域及び／又は前記第２の画像の所定領域と対応する領域以外の領域を参照して復号し、
前記第３の画像内の、前記第２の画像内の所定領域に対応する領域に対応する符号化データを、前記第２の画像内の所定領域以外の領域を参照せずに、前記第２の画像内の所定領域を参照して復号する
ことを特徴とする画像復号方法。 An image decoding method for decoding encoded data obtained by hierarchically encoding images constituting a moving image in a plurality of layers,
A first image corresponding to a first layer of the image and a second image corresponding to a second layer different from the first layer, generated from the encoded data, the first image A second image decoded with reference to the first image and a third image corresponding to a third layer different from the first and second layers, wherein the second image is encoded with reference to the second image A first acquisition step of acquiring encoded data corresponding to at least one of the third image to be converted;
A decoding step of decoding encoded data corresponding to at least one of the first image, the second image, and the third image;
Have
In the decoding step,
The encoded data corresponding to the predetermined area in the second image is the area corresponding to the predetermined area in the second image and / or the predetermined area of the second image in the first image. Decoding with reference to the area other than the corresponding area,
The encoded data corresponding to the region corresponding to the predetermined region in the second image in the third image is referred to the second data without referring to the region other than the predetermined region in the second image. An image decoding method, wherein decoding is performed with reference to a predetermined area in the image.
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